Improved extension step-laddeb



i stmt @Hiep Lenerspmm No. 77,463, dated May 5j, 136s.

rnrnovnn EXTENSIONA sTBPLADDBB.

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TQALL' wHoM- IT-MAYCONCERN: Be it known that I., -Lnwls B. Covnnr, of the city and State of New York,fhave invented and maden. cer- '.tain'new and useful Improvement in Step-Ladders; und I do hereby decla-re the following to be a. full, clear, l and exactdescription of the snid invention, reference being had to Ythe annexed drawing, making part of'this specification, whereinhsmall compass, for storing away,- or for transportation.

' Figure 1 is a. vertical section o f saidfs't'ep-ladder partiallyvextendnfi.

Figure 2 is an elevation of the same.

Similar marks of reference denote the same parts. This invention relatesl to a; step-ludder that can be extended, forincrensing its. height, or slidden into n My ladder isformed'of side-pieces, with two-part steps, between-whichnframe is ii-tted to slide, and carries swinging steps, that con be turned down dat, and held by keys, or turnedup edgeivi'se,l to pass between the two'- fpartste'ps when the frame is being moved in opening or closing-the stepdadder.V The back legs nre made. to

extend-ns the ladder is raised;

- By-this construction; the Yladder can be extended step by--st'ep, as reqnired,.up tothe-extreme length,.or.

' placed at once at'any intermediatepoint,'thus lalrgely in'creasing the facility with 'which-the,y ladder can be employed'nn'der varying circumstances.

In the drnwing, 'a u are theide-pieces. of the ladder.; b b, the two-part steps,'the p'nrts being securely united together. v

The-side-pieces a have grooves formed in their inner faces, invwhich the extension-pieces c c slide. These pieces c are united iirmly, near 'their middle and lower end, by thecross-bnrs d, and at theupper end by the* top step e.

The upper' ends ,of the side-pieces a' a are strengthened by the metal strapsf, seen also in Figure 3, nudn bolt, z', passing through-each of these 'metal straps, enters thefpiece c',- to hold the sinne when extended, th'esalid ,pieces c c hnving cavities in their outer surfaces, at the same distance apart that thesteps b are plnced, `so that the ladder may be extended the height o-fone umore-steps.

Upon the inner faces of the lextension side-piecesc c, I fasten metal castings,` g' g, formed as seen in larger size in Figure 4. The distancethat'these are apart-corresponds with the ,height of step, and Iplacebetween them swinging steps h 7i, that nre setto turn upon pivots 2, s o that they may pass down edgeivisebctweenb'the twofpart steps b, or be' turned down 'dat for n se, as seen in iig.- 1.

v In order to prevent -the steps -hzswinging inuse, when the ladder is ext-ended, I introdn'ce across','be" neath Y venchend, a. wedge,'3, that has a. dove-tnilededge entering a'corresponding grooveacross the castingg, and the other edge, projecting from such castiug, supports the end of thegswinging step.

braced 4by* lthe diagonale n. t

Albox is 'provided at c,vfor receivin'githese wedges 3 when notin use.

..1 l a're the back legs of the stepdadder, hinged,.at\4, to the topfstep le,nnd united by the cross-bars'm, and

' p o are sliding 'extension-legs; ieldto. the sides of the. lv-espective"4 legsl'by themetal bands, that allow -I end-moton, but securethejparts to eachother. The pins 6 are employed to prevent endmoton after the parts have been -properly extended, said pins' being entered into` holes provided 'for them.

:Inorder to briice the .legs o o when extended, the metal rods pp are employed.v Each rodis formed with n hooir atoneend, and a joint tothe leg l nt the other end, and eyes'or staples are provided at?, into which thehoo'kshre passed at the proper points. lWhen the ladderis not extendedQtheserods p are'tobeturned upwards, and4 held by a. loop or band, as seen by iced l i nes"ing.2. i t f A strap orcord, q,-nttal 1 ed at its ends .te legs fand-'provided' witha ring neartheniiddle thereof,

vsetting npon one f the hooks 8, is provided, tprje-vent the legsl movington fnl-from theAstep-.ladder when' 

